Question: Give me a mobile operating system, that starts with an alphabet 'w'.
Paraphrase: Donate me a versatile working framework, that begins with an letter set 'w'.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q920890 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'w')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Windows Phone 7.x, Windows Phone 7.x, Windows Phone 8.1, Windows Phone 8.1, Wear OS, Wear OS, Windows 10 Mobile, Windows 10 Mobile, watchOS, watchOS, Windows Phone 8, Windows Phone 8